A hazelnut-flavored spirit made by infusing roasted hazelnuts, most famously the Tonda Gentile delle Langhe variety grown in Piedmont, Italy, with neutral spirit, sugar, and often additional flavorings. It has a smooth, toasted-hazelnut aroma with notes of caramel, vanilla, and sometimes chocolate or coffee. It is used in Italian desserts such as tiramisu and gelato and in French pastries like eclairs and profiteroles, pairs well with dark chocolate and coffee-based drinks such as affogato, and can also flavor savory sauces, marinades, or roasted vegetables.